Josephson logic circuit powering arrangement

Details Josephson logic circuit powering arrangement Josephson logic circuit powering arrangement

1976-02-26

1978-05-30

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307212, 307277, H03K 338, H03K 19195

Patent

active

040925536

ABSTRACT:
An alternating current powering arrangement for use with Josephson junction devices which have bilateral gain characteristics is disclosed. Using an alternating current input to a Josephson junction logic circuit, it is possible to carry out a desired binary logic function during one half of an alternating current cycle; reset the logic circuit; and carry out a different binary logic function during the second half of the alternating current cycle. In the instance of latching circuits, the Josephson junction logic circuits are reset by the passage of the alternating current (which is normally the gate current of the Josephson junction) through zero every half cycle. In the instance of self-resetting devices, the Josephson junctions normally reset themselves to the zero voltage state. Single phase and multiphase logic circuit powering arrangements are shown including a shift register arrangement which requires only two phases to achieve passage of information from the input to the output of the shift register. All of the arrangements shown include regulating means formed from a string of series connected Josephson junctions, the I-V characteristic of which effectively clips both positive and negative portions of the applied alternating current. Also included is a scheme for powering the logic gates with a constant voltage source and the parallel arrangement thereof which provides stable and isolated logic circuits. Under such circumstances, the maximum value of current applied to the logic circuits is carefully controlled and a plurality of logic circuits may be connected in cascade but isolated from each other across the regulator string. The logic circuits utilized are per se well known and may consist of terminated line logic circuits connected to a pair of low impedance buses via a single current defining resistance or via a pair of current defining resistances of value equal to R/2, where the value of R is large relative to the characteristic impedance of the power buses. Also shown are transformer means for applying AC current from an AC source to a logic circuit via board-to-module, module-to-chip and chip-to-logic circuit transformers.

REFERENCES:
patent: 3185862 (1965-05-01), Beesley
patent: 3299283 (1967-01-01), Harman
patent: 3336484 (1967-08-01), Ovshinsky
patent: 3936677 (1976-02-01), Fulton et al.

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